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• n  a retractable fin keel used on sailboats to prevent drifting to leeward

• Mahogany over a steel frame, with keel, stem, and sternpost of wood, a dagger-plate centreboard streamlined and built of teak, plated with bronze.
• First they rip off each other's ruby-red ventral fins which look like a sailboat's centreboard.

• centerboard
• drop keel
• sliding keel

Quotes

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• Ben Ainslie in Independent
  It's a bit of a concern,Ainslie said. "It's just about getting to the size when it catches on your centreboard or rudder or you have to sail round it."